Piston for an internal combustion engine

Abstract

A piston for an internal combustion engine has a piston head with a circumferential ring belt and a circumferential cooling channel in the region of the ring belt, and a piston skirt having a working surface assigned to each of its major thrust side (DS) and its minor thrust side (GDS). At least one bore that proceeds from the cooling channel is provided. The bore ends in the working surface assigned to the minor thrust side (GDS), in the form of a bore opening, and is disposed at an incline, in such a manner that it encloses an acute angle (α) with the center axis (M) of the piston. The working surface assigned to the minor thrust side has a depression in the region of the bore opening.

1 . Piston ( 10 ,  110 ) for an internal combustion engine, having a piston head ( 11 ) and a piston skirt ( 17 ), wherein the piston head ( 11 ) has a circumferential ring belt ( 15 ) as well as a circumferential cooling channel ( 16 ) in the region of the ring belt ( 15 ), and the piston skirt ( 17 ) has a working surface ( 22 ,  23 ) assigned to its major thrust side (DS) and one assigned to its minor thrust side (GDS), in each instance, characterized in that at least one bore ( 24 ) that proceeds from the cooling channel ( 16 ) is provided, which bore ends in the working surface ( 23 ) assigned to the minor thrust side (GDS), in the form of a bore opening ( 25 ), and is disposed at an incline, in such a manner that it encloses an acute angle (α) with the center axis (M) of the piston, and that the working surface ( 23 ) assigned to the minor thrust side (GDS) has a depression ( 26 ) in the region of the at least one bore opening ( 25 ). 
     
     
         2 . Piston according to  claim 1 , characterized in that the at least one bore opening ( 26 ) ends in the working surface ( 23 ) directly below the ring belt ( 15 ). 
     
     
         3 . Piston according to  claim 1 , characterized in that at least two bores ( 24 ) are provided. 
     
     
         4 . Piston according to  claim 1 , characterized in that the at least one depression ( 26 ) is configured to be circular or semicircular. 
     
     
         5 . Piston according to  claim 1 , characterized in that the at least one depression ( 26 ) has a depth of 10 μm to 30 μm. 
     
     
         6 . Piston according to  claim 1 , characterized in that the at least one depression ( 26 ) is configured in the material of the piston ( 10 ). 
     
     
         7 . Piston according to  claim 1 , characterized in that the working surface ( 23 ) has a coating ( 23   a ) in which the at least one depression ( 26 ) is configured. 
     
     
         8 . Piston according to  claim 1 , characterized in that a bore ( 127 ) that proceeds from the cooling channel ( 16 ) is provided, which bore makes a transition into a bore exit ( 131 ), which ends in the working surface ( 22 ) assigned to the major thrust side (DS), and is disposed at an incline, in such a manner that the exit encloses an acute angle (β) with the center axis (M) of the piston, so that an opening ( 133 ) is formed in the working surface ( 22 ), that a deflection surface ( 132 ) inclined relative to the working surface ( 22 ) and making a transition into same is provided between the bore ( 127 ) and the bore exit ( 131 ), and that the working surface ( 22 ) assigned to the major thrust side (DS) has a depression ( 134 ) in the region of the opening ( 133 ), which depression forms at least one oil capture region ( 136 ) above the opening ( 133 ). 
     
     
         9 . Piston according to  claim 8 , characterized in that the oil capture region ( 136 ) extends crosswise to the opening ( 133 ). 
     
     
         10 . Piston according to  claim 9 , characterized in that the oil capture region ( 136 ) forms an oil collection reservoir ( 137 ) on both sides of the opening ( 133 ), in each instance. 
     
     
         11 . Piston according to  claim 8 , characterized in that the bore ( 127 ) runs in a material thickening ( 128 ) formed in the interior ( 129 ) of the piston ( 110 ). 
     
     
         12 . Piston according to  claim 8 , characterized in that the opening ( 127 ) is formed in the working surface ( 22 ) below the pin boss center (N). 
     
     
         13 . Piston according to  claim 8 , characterized in that the depression ( 134 ) has a depth of 10 μm to 30 μm. 
     
     
         14 . Piston according to  claim 8 , characterized in that the depression ( 134 ) is configured in the material of the piston ( 110 ). 
     
     
         15 . Piston according to  claim 8 , characterized in that the working surface ( 22 ) has a coating ( 22   a ), in which the depression ( 134 ) is configured.